The SIS Pension Fund invests in a pool of more than 100 union-built commercial properties managed by the Multi-Employer Property Trust (MEPT). Real Estate investments do not generally have investment returns that follow the stock or bond markets. Therefore, Real Estate is considered to be a good asset class to diversify investments and to reduce the overall risk of an investment portfolio.
Because Real Estate is not a very “liquid” asset (it cannot be bought and sold quickly), it can be difficult to include Real Estate in an individual account type pension plan like the SIS Pension Plan. To minimize this liquidity issue, each of the five investment choices available in the SIS Pension Fund has 5% of the money allocated to Real Estate.
Investopedia – Portfolio